Well, this explains why he was using outdated memes from 2016. He really found /r/mems and /r/dankmemes to be the shit apparently. I'm going to start calling him the Reddit shooter. You should too.
He thought this was based. Kind of is actually, not going to lie.

Looks like he started hes journey on becoming a radical around the beginning of 2020. I can't think of any event in particular that would do that to him. He commented a couple of time on /r/FragileWhiteCrakkkas and /r/saltywhites and had some spicy takes on other subreddits.

It is likely this is also around the same time he started going to /r/QualityTacticalGear and /r/Ammo. The comments are much later but I would suspect he lurked around subreddits like these for a while.
I find it hilarious that he is quite fond of /r/virginvschad. Not helping his case of not being an incel.

Looks like he was a mask wearer lol. MASKS TURNED HIM INTO A SCHOOL SHOOTER!
The virginvschad meme he's referring to below.
And his last comment ever was on /r/Ammo from today.

I guess he has the experience now to back that up.
All of his comment history on Reddit can be found here.
https://camas.unddit.com/#{"author":"Jimbo-boiii","resultSize":100}