Yeah, that's quite an observation, I must say. I noticed that while playing the third time.
It looks like the public opinion about tinies kind of belittle the fact of their existence as intelligent life in comparisson with Giantesses. It's like they treat tinies as "equal" because it's a law and stuff, or the right thing, but in reality normal sized persons are beneath them. The few exceptions I can think of are Eliette, because she is literally an angel, and at some point Regina, who may treat any life as something precious (untill that life decides to illegaly chop some trees), but still capable in doing weird stuff.
You mentioned Bezvy, and I agree to that, but your point was just about being together, which doesn't really show it. What I saw though, is that her actions are on an edge of being too much in both introduction scenes: When almost crushing MC under Eliette she basically says "Sorry, didn't see you there".
Excuse me? You nearly killed a person here and that's all you will say? Perhaps, he seems not as much person as you are, hm?
At Maryen's route she picks up an unknown human (mc) from the ground and start squeezing him like we could do that with a pet dog for example (you can say that it's part of her energetic and friendly personality, but come on, it's too much, even MC gets a chance to say that). And that's one of good examples when this relationship shows: she sees the cute little thing first, and a sentient being second.
Sheina is also at fault here (except for teasing, because it's a side of her character and all): she doesn't diminish MC in any way in public (a scene with a table though), because it's wrong, but when drunk and private enough, she did enjoy that this cute little tiny couldn't defend himself from her feet. Yes, she will be really worried if hurts your leg, but still, this kinda feels different simply because of the size difference.
Nothing much to add about Regina's example, she really does put MC in danger with Diula. Quite careless move for someone like her, especially when she admits that Diula could hurt him due to her hunger. Maybe she just knew that healing MC won't be a problem if something bad happens, which is still sus.
Brais and that elf mage didn't do anything because they probably accepted rules of the game. And hey, what could they do anyway?
Geminigems are helpless perverts, that's their thing, but yeah, the fact that Sheina leaves MC to them knowing perfectly how will they react kind of falls into these accusations, but it's still not enough though. Helga and Croixelle didn't care much due to the same reasons I mentioned before. And why would they? It's not like they're losing anything living like that.
But, no matter how wrong this may sound, it's pretty much realistic. How infinetly gentle and kind giantess may be, the first thing she sees by looking at tiny is a small, defensless, weak version of her species, and then all that moral things apply to the picture. Accidents are certainly often too, needless to explain why. The world simply says: "Some of them will treat you gently, others will enjoy torturing you, but no matter the side, you're still a helpless weakling". Maybe that's what Homaspernians mean by hypocriticism of Keisiema?
It's hard to put this relationship in words. It is like... a slight disdain maybe? This innate understanding that if giantess uses even 1/10 of her strength in 2 fingers, this little human will turn into a sack of meat and bones without a chance of resisting.
For us it's like looking at the ant: You don't have feel hate, why would you? But you do realize, that it can't do anything if you try to hurt it, except in GG world those "ants" are persons. Maybe this is a rudimentary form of sadism and domination need or something... lack of which Eliette compensates with her lethal clumsiness, lol.
What's cool about Maryen though is that this strange subconcious sensation gets exaggerated as being a part of her true self. Again, she does not hate MC, on the contrary, she starts to really love him when we get to the part with the castle cell, but she is craving the feeling of his weakness towards her, feeling of his total helplesness and fragility, that no bone in his body will stand if she just tries to break them.
Surprisingly, we might've just opened a new perspective of why neutral towns hate all giantesses with no exception. And for real, when a giant demoness attacks a town and a giant guradian arrives to stop her, being between them must feel like being an insignificant toy in a playground where 2 kids fight to get the right to play with you.