WWYD Re Racist Text "Jokes"

[lifeslikethat]

I have name changed for this post as my profile makes me very easy to recognise in RL.
DH has a friend who, in my eyes, is very racist. I have no idea how DH can be friends with him and I personally refuse to talk to the guy. He frequently sends DH racist text "jokes", in my opinion they are nothing but offensive.
My concern is that this guy works in a school that has a large number of non caucasian pupils. I guess it could be argued that if he isn't showing any racist tendencies at work then his own opinions are of no concern, however something is niggling at me about this. Is there any legal wrongdoing in sending these texts and what do other MNetters think about this situation?

If he gets found out, he could be out. Why would he even risk losing his job, unless he thought his attitude - effectively scorn for many of his pupils - was all right?

Bring it up in conversation next time, with a warning. Even if he doesn't change his mind, he should be forced to realise it's considered unkind and not nice (to say the least), and be forced to accept the "inconvenience" of keeping his ugly mouth shut.

If you don't talk to him, you could always take his number from DH's phone and text him back about one of his "offerings". That could scare him... and make you feel better! After all, one of the traditional weapons of racists is fear/intimidation. It's nice to think about turning that same weapon against a racist, isn't it?

Text back and say 'that's not funny and is in fact very offensive, if I were you I would be careful what I said'