Can't speak for all Newcastle fans, but the ones I know always had a soft spot for Man City probably because of our tete a tetes with Man Utd in the 90s. When you won the lottery we were happy for you, you'd shake up the established elite and for a team with history and a good fanbase to get back among the big boys was a blessed relief after Chelsea's rise.
Not going to lie, there was a little jealousy when we were at our nadir under Ashley and you were hoovering up the best managers, players, and trophies galore. Now that we've got our new owners there's a sense of being in the same boat; the established teams trying their damndest to shut the door on us, the conversations about sportswashing, people seeing corruption and cheating where in reality it's just good football people making good football decisions. Just need to start getting those trophies.
Always have a good laugh with you lot, more so than fans of the other 'big clubs'. There isn't the entitlement, the arrogance. There might be amongst some of your newer fans, but the blokes I've chatted to are decent. Any time I've spoken to Man City fans they remember where they were before the takeover, watching your team lose to Stockport County and shit like that. It helps that your manager is likeable, that you play entertaining football and your players aren't... (I dunno what the profanity filter is like on here so insert your favourite pejorative here).