How much of social faux pas is it to "make change" When using a paid bathroom?

I have never done this but always wondered- often when I want to use one of those attended bathrooms, I often only have 1 or 2 Euro pieces in Kleingeld.

I assume its considered at least weird at most incredibly inappropriate to make change there, but can someone confirm?

In the past I have spent 2€ when it was an emergency.