Yes, that's definitely a problem. But then I'd say you're trying to use it on the wrong group of people.

Many people here (I hope) would very much prefer it if you told them "hey you're dull" to you making up excuses every time you come across them and they try to talk to you, whether it be to reflect on why you think they're dull, or to stop wasting both of your time by trying to interact with you if you aren't even interested.