Absolutely, but the same idiots that text while driving and microwave grapes can also buy bikes, so the existence of idiots on bikes cannot be assumed to represent a philosophy for cyclists at large (in your area, anyway). Are these things you see many cyclists doing? Or just things you've seen a cyclist do?
I see the concerns you've listed, and I agree they're not safe. But I know why people choose several of them, even if I personally don't do them. I have headlights and a reflective vest, but if your hobby bike doesn't and you need to get home after dark, you deal. If there's no safe space on the road, or the visibility is too poor, you deal.
Some of the other things you name, I haven't seen and cannot fathom why somebody would do such things. We're probably not from the same country (let alone area) so our cycling infrastructure will be different.
One of them I have done: riding the footpath in the opposing direction. I'm going at low speed so I can brake, but the only risk is of a bad driver being impatient - the same risk a mobility scooter, mailbuggy, skateboarder etc would have. And I do this if a) the road only has one path, and the otherside i would be exposed on the shoulder, or b) when my destination is close on the same side because it makes no sense to cross the road twice within 100m. Both are decisions I make to reduce my exposure to cars.
That's fair, and you raise good points. Thank you for sharing and explaining your perspective.
The perception of cycling in general is already negative, but I suspect it has less to do with idiots on bikes and more that bikes can't help but be in drivers' way. Yet I still hear NIMBYs actively fight against bike lanes because they think cyclists are entitled, and don't want to lose parking spaces to them, or get longer commutes if roads are converted to one-way. That's not something responsible cycling can fix; that's a direct result of car-centric culture being resistant to having a smaller slice of the pie.
EDIT: One thing to add. Human psychology is weird, and it treats being inside a car as like being in one's own house. 'Road rage' is a real phenomenon of drivers feeling 'territorial' in protecting 'their' space. It means theyre more reactive, more impulsive, and often more spiteful. No doubt in part because driving is a highly demanding activity mentally, especially at higher speeds, so adrenaline spikes easily.
By comparison, we don't get widespread 'supermarket rage' with our shipping trolleys, because it feels like a public space in a way 'inside of my car' doesn't (and we're slower and have time to think). And unfortunately, there isn't anything cyclists can do about that, either.
Also, correction: I didn't say all the things that piss off drivers are being done to make us safer. I said all the things that make us safer still tend to piss off drivers. Part of the Road Rage issue is that drivers get pissed off over any perceived infraction, regardless of context: even if their own inattention is at fault (like blaming people on the footpath for being in their way). Usually, the feeling passes In a couple seconds, but every now and then some asshole tries to run you off the road to 'make a point'...