Yes, he is a native English speaker.
No, he's not an English major. He writes with improper grammar.
Most Americans have regional dialects based on where we live this however is more likely to be an improper speach patern steming from a poor education level. "May can" is a comon phrase among the lesser educated. Another common double modal is something like “he might could help you” Additional examples of lesser educated speach styles would be something like "them things" instead of those things, or “everything what he told you” instead of everything that he told you.
English is a pain in the butt language. we start it in 1st grade and take it every year for 12 years. Then we graduate and if you go to university We still have to take it again, and if you want to get a degree in it you have to take 4 more years worth.
It's not uncommon for some people to write with the same poor speach paterns that they pick up from the society they are raised in, that's just the way it is...
I do understand that it is anoying, I get it. Personally, I find it extreemly anoying when people interchange "Then" and Than" and say something like "Given the choice I'd rather have chicken then shrimp. I hate shrimp." obviously what they mean is "Given the choice I'd rather have chicken than shrimp." (for those non native speakers who don't understand the difference, the first means you will eat both chicken and shrimp but have a preference in the order they are eaten. the second statement means that if you can choose you want chicken instead of shrimp)
Anyway, I digress... BD is a native English speaker, he just has some bad/wrong speech paterns.
