I understand the meme and the joke, as long as the person you're doing it about has a sense of humor and doesn't mind.

In general, making fun of people without their consent is always wrong though.

Until downvoting and flagging is figured out on steemit (which it isn't), you can lose your reputation very easily for these things.

In society, it's normal for friends and family to poke fun at one another, but that usually happens between friends and family. Doing it in public carries a lot more problems and is not recommended.

You might have asked him first if he didn't mind, and saw the humor in it.

When it comes to public figures (celebrities or politicians) we generally find it acceptable. When you become a public figure (specific to celebrities or politicians) this is understood as a cost of that...

I wouldn't say he's a celebrity or a politician... so these memes "which can live on the internet forever", really should be scrutinized before being posted.

What might have taken only 10 minutes to create and post, will now live on the internet forever. A funny joke, living forever and being part of someone's life history on the internet really needs careful consideration.