I do them in photoshop. They are not actual glitches made with code, they are purely artificial. I usually draw something and then i chop it up with the selection tool. I then utilize layers, color curves and various built in photoshop effects. So the way i make my glitches is nothing fancy really. But i prefer making them by hand rather than with code. Doing actual glitches is so randomized and becomes soulless as a result. When i draw them myself they are predictable and i can control them to suit my artistic vision. God that sounds pretentious as fuck, but yeah, that’s what i do and why i do it.