Uneven syntax isn't a problem if both people like it that way. Uneven desires for the relationship are a problem though.
I dunno, I used to be friends with guys, but I've found that it doesn't work. There's always a breaking point, and then one way or another it doesn't end well.
I try to keep a certain distance from guys I talk to online for this reason as well. I avoid phone/voice conversations and don't use a webcam in one on one conversations (even though I often do with female online friends).