Do you think that guys can be tsundere?

Those that are insecure about their emotions call other men that aren't afraid to show emotions, pussies.

OT: Yep. RL and Anime. A few anime examples include:

Inuyasha (Inuyasha)
Syaoran Li (Cardcaptor Sakura)
Hiroki Komachi (Chu-Bra!!)

Yeah, I think there can be male tsunderes. Even through there are men who are taught to hide their emotions, even I do this sometimes. Males can act like Tsunderes. Even act like the sterotypical tsundere sometimes.

Yes. From what I can remember I use to pick on the girls that I liked back in Elementary (Primary) school. But I think a female who is Tsundere is much more cuter than a male. Maybe it's just the voice but who knows.

Don't see why not, but male Tsunderes get away with much less than their female counterparts.

Sure, I don't think being tsundere is gender based

Most certainly. I myself am very feminine on the inside but being male i have to be more manly. That counts as tsundere correct?

Here ya go. Home brewed tea. But it's not like I made it fer ya!
The customer who ordered this left already!
Huh? I didn't anyone else on to serve and I'm your first one?
Stupid! I-I-I-I had served others before you!
Liar! Idiot! Go die!

Yes, and I enjoy teasing those type of guys. Their annoyance amuse me.