People can clearly change their personality, it's just so difficult that most people don't try or give up when they fail.
I also think personality is not unique - we have a whole range of "personalities" we employ depending on who we talk with and what the situation is. Thus, personality is a function of self-values and external situation - we have many masks, one for each occasion.
You can't listen to someone because his style and choice of decorations is different? At least you recognize that you're biased, but you should really try to fix that part of your personality.
You'll miss out on a lot in life if you immediately disregard things and people just because they're slightly different than what you're used to.