Don't worry about it. There are some silly people around, maybe he wasnt laughing at you or maybe he was embarassed because he likes to play with little miss make up dolls or something.
I always feel a bit nervous when looking and buying muppet stuff or DVDs in the kids section but then I think, we are all allowed to like what we like and I think the muppets is the best thing to be a fan and collector of. I am a muppet fan and im proud of it!
When I bought my swedish chef playset I got a few looks and there was even a boy who knew my brother at school watching because he kept laughing and telling everyone that I liked the muppets.
When are people going to realise, the muppets arent just for kids, I think they are made for adults maybe even more than children in the muppet show and various movies etc.
And the Palisades figures are certainly not kids toys, they are toys for big boys, and girls too! lol. They certainly arent what you would give little kids to play with and destroy, although I have heard of someone doing this.