But this is a business and guys can see who they want, and when they want. If I'm asked for a reference I'm willing to give it, with no questions asked.
I know I like my variety in partners, why should I limit my clients' desire for variety by badmouthing them or being rude if I'm asked for a reference. But I've never been accused of being rude - but a couple close friends say I'm too nice.

I don't care what kind of a day the person is having, being rude is uncalled for.
Granted sometimes I may not be online for a day or 2 if I'm busy with family & don't have my hobby phone on or pay attention to email, but I will respond when I can. But I usually start my reply with an apology if it's been a couple days since they asked. I do check email frequently so that is the best way to get a reply quickly.