As it relates to abuse and throwing out a bank president's name, I had a CEO once tell me "if she has to throw out my name to try and get what she wants, she obviously thinks she can't get it on her own for a reason." He really didn't want his name thrown in for special treatment.
Personally, and depending on the abuse, I think a warning is in order for the first time. I can only remember once that a customer was so loud and abusive, and wasn't responding to "calm down" requests that I asked him to leave and to wait for the check closing his account. Stress, bad days, we all have them. That is a reason, not an excuse. But it is also a fact.
(BTW, if I've offended any of you, I apologize.)