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monkey123 There are just as many reasons on why people dont pvp. maybe they arent looking for pvp in PVE mode, maybe they have other objectives. maybe they actually like the other parts of the game but it got mixed zones only so they have no choice.
You say you do it for a challenge and maybe some others share the same sentiment, but i dont see what is challenging about fighting players that's got presumably lower level, is not built optimally for pvp, is not in the mindset and/or also not have experience in pvp. Of course they wouldnt be, they're in pve zone with intent to do pve things. 
I despise pve games with pvp within pve zones. when im out to grind exp and farm mats im not there hoping to get ganked or looking for a pvp, and i wont be geared or built for pvp sake too. pvp specific zones are fine, i wont be shitting on them but i also wont be touching them,  I got mobas and planetside for all my pvp needs against consenting parties. Games with this kind of feature simply tagged on with no consideration to both parties' player experience deserves to get every bit of toxicity and backlash that it's own players brews.
Fine, you do it because you want to, but you have no right to call people names for not liking what you like especially when you do it despite others' consent.
That's like throwing stones at people because you wanted to, then calling them names them when they say they don't want to be thrown stones at. Go throw your stones at people that also want to throw stones at you. 
You also didn't like it when people steal "your" farm spot in a public zone even tho you didn't consent to it, did you.