Just got banned from lgbt sub

I think it's because of my recent argument with this guy who thinks it's biphobic to say bi guys are more likely to end up in hetero marriage.I'd like a discussion here, am I wrong for assuming that? It seems logical to me but it appears i have offended people because i actually got banned for that from the sub, this is a first.Anyway you can read it here http://ift.tt/22pW0Gr case you want a tldr: I told OP not to be too hopeful in having marriage with a potentially bi guy because they are more likely to go for a woman, i got attacked for being biphobic and banned.I even said that i didn't mean all bi guys will go for a woman, but just that i think they are more likely to because of all the benefits. My argument was that if the guy had similar attraction to both sexes, he will probably choose the easier option and go hetero after having fun in youth, because of marriage, kids, family acceptance etc.So am I wrong to assume in a chance i got from using logic or am i missing something?