I don't know enough about Microsoft to know what they're like on top.
Sony starts pumping up prices because "If people want it, they'll pay for it" at the end of the PS2 era - but I don't recall anything crazy out of the PS4 era.
I find Nintendo is the opposite. They're most arrogance and quality of support is worst when they're at the bottom. A good example is when their CEO, Hiroshi Yamauchi, began insulting RPG fans because he was angry with PSX finding success with the genre. At the same time, Yamauchi became hostile toward third parties, particularly Square, closing off possibility of Square developing more games for Nintendo platforms. Nintendo would also fluff up their announcements by showing many games that would either never come to materialize or appear years later as something different than what we were shown - sometimes even coming out on other consoles. During the SNES, Wii/DS, and Switch eras - this stuff didn't happen nearly as often (the only even remotely problematic game that comes to mind right now of those announced during the Switch era is Breath of the Wild 2). And being on top in the handheld didn't seem to stop their bad behaviour in the home console sphere, because they had Gameboy/GBA and 3DS during the N64, Gamecube, and Wii U eras.
I describe myself as a little dose of toxic masculinity.
