Tagging on the back of pros when they're doing any kind of efforts or interval blocks is an absolute no-no..
If they're just rolling easy/ doing Z2 it's a bit different but if you're gonna sit on for more than a couple minutes it's probably best to ask if they're alright with you tagging on the back for a while.
Anyone who actually trains knows how irritating it can be when you're pushing hard. Even if you're not pushing, for someone like Jonas who is a bit on the spectrum/hypersensitive it's gonna be really annoying if someone you don't know won't get off your wheel.
If the guy cannnot read Jonas body language to see that he's not wanted there then he's clearly lacking a bit of social intelligence.