Y'know, now that I think about it, c!Tommy has plenty of reason to hate c!Techno outside of the fact that c!Tommy blames him for blowing up L'manburg.
c!Techno's done some pretty wild things, such as:
1.) Canonically killing Tommy's best friend, causing him to be on his last life
2.) Directing a wither towards Tommy while monologuing about how he can die like a hero if he wants to so badly
3.) Actively helping Alivebur with his plans to blow up L'manburg
4.) Killing all of Tommy's friends at the festival at least once
I always found it strange that c!Tommy hated c!Techno before, but now that I think about it, it seems pretty justified. . . Too much Techno on the brain, blinding me from the truth