To dislike MIL asking DD (3) if she has a boyfriend yet?

[JimbosJetSet]

DD is 3.5 years. MIL often asks her about her friends, and if she has a boyfriend yet. If DD gives her slightly older male cousin a kiss, MIL wolf whistles and makes a big deal of it.

Obviously she is joking and thinks her comments are funny, but it makes me feel uncomfortable. As though she is sexualising DD's relationships with boys and making her conscious of things she shouldn't need to think about until she's much older.

Am I just being precious? Do I need to get a grip? What can I say to her to stop the comments? She is a lovely lady who adores DD and I wouldn't want to offend her.

It's not an age thing, though. My mum is very sensitive to that fact that DD, at aged 13, has just had her first boyfriend (short lived and dumped, although they are still friends). And there has never been any of this kind of behaviour in her early years.

Mum's supported me in helping DD to see she can talk to boys as well as girls and just be friends. Her group of (female) friends get on well with the boys in their form, and I think that's how it should be. Not spouting stuff that leads to early sexualization.

Can you not just say something along the lines of

"Please stop making comments that sexualise my child" every time she says it.

(Said with the normal as long as you would react the same if it was your own mother blah blah blah that's obligatory on a mil thread because of course that bit needs to be said and not left unspoken)