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I have to say i have, in my whole life, never heard of an residential ISP blocking a single port (at least if you don't live in china, russia or similarly run countries). If they have an issue with services you have running, they normally either contact you or disable the connection as a whole first and ask questions later. There are some shenanigans regarding traffic shaping tho (often used to annoy torrent users). Are you on a shared medium (a.k.a fiber to the curb)? In that case, if you generate loads of traffic, they might throttle - but in most cases not block - your connection, because it can cause an already overbooked line to generate issues in your local area; but this would persist even when changing ports.
What i have encountered more often are consumer level routers that don't handle lots of connections at once well, causing them to freeze or drop traffic. My ISP provided cable modem / router (in my case in bridge mode so i can use my own router) freezes for a minute when starting torrents and not limiting the amount of connections created per second, and repeats the freezes every time the connection comes back and the torrent client continues to overload the router.
I believe I am sharing something with my neighborhood, since one company is responsible for all the fiber in this area, renting/leasing it out to various ISPs. My connection is being received and modulated with an ONT in my apartment (or in the basement, in which case all the eight residents/apartments share one ONT?). My subscription is 1 Gbps. I sure hope that even if the ONT is that huge whirring box in the cellar and not the quiet one in my apartment, they use industrial grade CAT8 or 7 cables to connect to the individual apartments... How else would the ISPs be able to deliver 1 Gpbs to all the residents simultaneously.. ๐ค Anyway, my router is a Raspberry Pi 4B running OpenWrt.
I totally agree and that is also what I expect: if they have a problem with my usage, I'm sure they'll contact me and kill or nerf the whole connection, not a single port...