It's not bad to have some fun - that is what couples do, right?
However, from personal experience, the internet is overloaded with people who are judgemental.
These people really need to learn that the internet is a very widely-used information medium these days, and what they do online should transpose to their real-life personas. With that, some people just get all bent out of shape on the personal display of affection (PDA). I actually read in the textbook for my management class that PDA often makes people uncomfortable, whether it is a straight or gay couple doing such a thing. I personally don't have a problem with it, if two people love each other, that is what counts.
If you have a video of you and your gf up on YouTube kissing, so what? Let these people make bad comments, do they really matter to you? Not to sound harsh towards you, of course.