I've lived in Pittsburgh for a couple years now, but aside from Preseason games, the only Steelers or Ravens game I have ever gone to was the 2014/15 Wildcard Game. My friend (Steelers fan) wanted to go and bought me a ticket so he could stay at my apartment. I wore a Ray Lewis jersey around the city all day. Most people absolutely loved it- it was crazy. I went to a couple bars near Heinz before the game and people were buying me drinks and taking photos with me- it was a great time. There were definitely some assholes out there, but for the most part Steeler fans were happy to see a Raven fan that they could talk to.
Then that game started and things went down hill fast. By the time the fourth quarter rolled around Steelers fans were screaming, cussing, throwing food and beer at the Ravens fans in my section (Honestly a lot of them were being assholes and deserved it- I'm personally not a loud, vocal fan during games, but the dude next to me in the Pollard jersey definitely was). One dude tried to lunge at a Ravens fan after the Gillmore TD, but caught his foot on a seat and fell and got stuck in the aisle (he was fine, it was hilarious though).
It was definitely a worthwhile experience, but I wore my jersey under my jacket out of the stadium- wasn't looking for a Yuengling shower on my way out. Not sure I'd brave the freezing temperatures again when I can sit in a warm house and drink cheap beer instead while actually seeing what's happening on the field.
