Wait 48 hours.. Everyone is reactionary, and things usually die down or resolve themselves. If someone is aggressive on the phone or in an email, be polite and professional, and say you’ll get back to them in a bit, that you need to discuss the matter further, or consider the options. This will not only give you time to find the best course of action, but the problem may also naturally resolve itself.
Discover the kryptonite. Generally, individuals are stronger in some areas than others. You may have noticed that some can be very nasty in email, but completely different in person. If your bully sends mean text messages but has no gumption face-to-face or on the phone, then by all means, make a phone call or schedule a meeting.
Keep your mouth shut. Without being disrespectful. Remember that sometimes you must keep your mouth shut because it is not about you. You have a responsibility, and you cannot risk blowing the deal because you lashed out. Best to just bite your tongue!
Stay busy. When some are overdramatic or too attached to a specific issue or transaction, it is because they are not busy enough. If you are very busy, you do not have time. So, if you want to beat the bullies, just stay busy and don’t sweat the small stuff.