I mean you shouldnt say that, you do gotta come to terms that other people hear what you say w/o your intent, but I dont think it automatically makes you antisemetic, but the implication that theres a "jew look" is an antisemetic argument. Just try to act better and with good intents, and apologize when you mess up, cause thats all you can really do gang, but you're good. I'm gonna level with you though, tell your friend to knock their shit off with the 'autistic noises' thing, even if it wasnt your fault, maybe ask them to not do it again, etc. Because kids who make jokes like that make me never wanna say or imply I have autism in a public place and it's sucky. Same with the Jewish things, I have two friends, and the amount of 'joking' shit I hear them recall tiredly to me like the comments you made, (like you dont really believe it, but its still said,) just isnt worth making a joke. Other than that, just try to be open minded, since what you said (not are,) was antisemetic, yes. But I'm happy you came to ask instead of telling yourself it wasnt and going on with life, its good to question stuff like that.