Am I about to make a terrible mistake?

[Person]

I have a few friends who are huge fans of the new My Little Pony tv show. We are all a little old to be enjoying it so much (18 to 19 years old), but we can't help it, we love the show to death.

My friends post funny captioned pictures with the pony characters in them on Facebook. Some of those pictures are downright hilarious, and I've been tempted to share the pictures on my wall too. I asked my sister if that would be fine, and she said: "I have 3 big reasons why that is absolutely NOT fine:
1. You will not taken seriously by your friends, family, co-workers, or prospective employers anymore
2. You'll annoy the hell out of all of the people on your friends list
3. You won't have a chance of getting a girlfriend ever again"

I just want to post a few of them and share my interest, but my sister says that there could be major repercussions if I do that. I don't want to set-up a fake account to post my pictures from. What would be the point of that if none of my friends were seeing them? Plus, I think it's wrong to judge a person by the type of humor or media they enjoy, so it'd be their problem, right?
What do you think I should do? Would you be annoyed by funny pony pictures?

[neha mounika]

Its just a funny picture!
Be yourself its your wish.

[fll]

Be yourself! everyone has a childish side to them. If you are worried about prospective employers make your profile private.

and dont worry about everyone else, because you cant please everyone, but then again dont go mad on posting these pictures.

and if your friends are doing it, why not you?

and you dont need to change yourself to get a girl (: a girl should like you for who you are.

[joppa]

Wel, with point1 theres alot of truth in it, i mean we do live in stuck up societies that r not very open minded. So that depends whether u cud care less or what. Point2: i thought ur friends r doing the same thing? The rest r just aquintances so could u realy care that much about thr prejuducial opinions of u? Point3: personaly, i wud prefer any gf of mine to accept me for wu i am n wot i like. I dont think ur making a mistake. Btw, how old is ur sis anyway!

[Windowphobe]

This is the true advantage of being really, really old (58): I have hung pictures of Derpy and Twilight Sparkle in my office, and no one says a word to me.

And if something MLP-related shows up in my FB timeline - well, those who object are free to unfriend me. So far, no one has.