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Something I like to do when people cut me off, especially if its a habit, is not to let them do it. You just keep saying exactly what it was you were saying. Just keep talking right at the same time they are talking. They will usually get the point without you even saying anything. Just keep your normal tone and finish your sentence without giving way to their rudeness.

Just smile at him often, a boss is always a boss, meaning try understand his likeness and negative traits.You can also try putting yourself into his shoes, now you would then understand his side. As regards to dry sense of humor, start with your lively humor and your boss might imitate you, that is what we call LIVE BY EXAMPLE.

Thanks, and Good day.

You could nicely say "excuse me but I was not finished."

Also there is nothing wrong with a dry sense of humour. The gum thing, well maybe he isn't a bull.

quit your job and look for one that you are happy with.