Oh goodness, all the time. Don't feel alone at all. I think part of being a Britney fan is dealing with the teasing and whatnot.
I'm not always teased though, per sé. Sometimes, it's just straight up criticism. I could say, "I am a big fan of Britney Spears" and the hater would retort, "SHE'S A SLUT. SHE CAN'T SING. SHE'S FAKE" -- the usual.
I don't know many people offline that are big fans. There are a couple of people, but the rest either make fun of her or diss her. I used to be upset about it, but now I'm used to it.
A lot of people don't understand Britney. Some hate her for no justified reason. And some people know her music and just don't like it. That's just the way it goes. Hopefully with the new album, a lot more people will respect her though.
You can't let other people bring you down. You like what you like -- take pride in that. Their opinions are nothing. And I guarantee a lot of people that hate on her really like her deep down. Not every single person, but some of them.