Though "acceptable"... I'm fairly emotionless, very hyper-rational and I accept a whole range of outcomes very easily... your choices, your consequences... I accept you keeping the same username, I accept you changing it to whatever else that is non-offensive, I accept you changing it to something offensive and getting yourself banned for trolling, it's all acceptable to me.
At a guess you haven't heard about Domonic Cummings silver tongued way of refering to collegues (well members of BJ cabinet) in messages to the COVID enquiry. Though it would a great user name.
If you need to ask, the answer is probably no.
Though "acceptable"... I'm fairly emotionless, very hyper-rational and I accept a whole range of outcomes very easily... your choices, your consequences... I accept you keeping the same username, I accept you changing it to whatever else that is non-offensive, I accept you changing it to something offensive and getting yourself banned for trolling, it's all acceptable to me.