If you're a lover of bitcoin, then you're a bitcoin maximalist, because you can adopt for its use, invest and make profits from it, this is because you understand more about the network and are willing to make every single opportunity being taken with utmost advantage.
I don't think every lover of Bitcoin is a maximalist from what Op explained as the meaning of maximalism and maximalist perse. Maximalism have no single regards for altcoins, they see Bitcoin as one and only way to maximize profit from digital assets. A good number of us here believe in Bitcoin but still interact with altcoins despite the high risks they posses. Going by the definition of maximalism, we are lover of Bitcoin but not absolutely maximalist.
or should we just accept that we all have different strategies, preferences and goals while coexisting in the crypto industry?
Yes, this is the fact. Individual preference, strategy and goals play a vital role here. Moreover, having a little altcoins in your portfolio will not demean Bitcoin. To some, the combination of the two is the best practice as putting all eggs in the same basket is too risky.