xfinitywifi connects first, even when it shouldn't

At home, xfinitywifi will often connect before either the proper wifi connection served by Comcast's router, or the wifi from my personal router. I have set the priority order for connecting to wifi on my laptop, but xfinitywifi still connects first. When I'm out, I've had many similar experiences where xfinitywifi connects successfully, even though the connection is so bad/distant that it's non-functional. I can be riding down the freeway and my phone will stop getting data, because it successfully connected to a random xfinitywifi with no actual signal. I love being able to go almost anywhere and get wifi through xfinitywifi, so manually enabling/disabling it is a workaround I'm not excited about. I don't expect anyone to solve this issue, I just hope someone in-house at Comcast gets the message, and considers the situation. I've experienced this over the last year on Macbook Pro, iphone 8 and iphone 11 with current OS's.