Heshy:
Like you say, the issue here is not about whether she is objectively wrong, but about the fact that it is embarrassing you.
I’m guessing you’re hoping to convince her to stop, and were hoping you could say she was doing something objectively wrong.
I think you will be better off having an open conversation about it with her.
Perhaps she feels too exposed in the tighter one. Perhaps she can get a different one where you won’t be embarrassed and she won’t feel exposed?
In any event, one or both will probably need to compromise, but the most important thing is that you are both aware and respecting of each others feelings on this.