I also bristle somewhat at the moniker "Father of Bitcoin Maximalism". THere is certainly crossover there, but most "Maximalists" today have no idea who he was, and his brand of maximalism differed I think. i think the title "The earliest bitcoin maximallist" would be more accurate.
I would consider myself a maximalist, but then I don't necessarily discount the alts outright so some may disagree here. However the word "maximalist" or "maximalism" as it refers to bitcoin seemed to have originated from an alt-coiner, namely Buterin, so it would also seem to be intended as a derogatory term instead of as a badge of pride as some others use it now.
I think it's like the words "geek" and "nerd" ... some people think it is an insult but some call themselves the same name proudly.