It seems out of this world to me but in the late 70s/early 80s my dad and his mates just used to go to whatever team was playing at home for the most part. Even on occasion going to Wembley to see the other side play.
Throughout my life I have had friends who support Liverpool, although they mostly didn't follow football in general that much.
I'm probably wrong but my own personal opinion is that the rivalry heated up in the mid 90's when Liverpool couldn't buy a win against Joe Royle's Everton. They had money and players who made celeb gossip problems while we had fighters who would die for the cause - and play some decent stuff too. Then Liverpool manager Roy Evans, who apparently couldn't control the more colourful personalities at his own club, frequently made bitchy comments about our style of play.
I think relations could have been soured after Heysel, but the Hillsborough disaster brought the city together.
When I've met friends of friends down the years, on several occasions, when finding out I was a blue, I would be asked "Why'd youse always say you woulda won the Yoorapeean Cup if it wasn't for us (Heysel)?" An instant greeting trying to goad me into a 'bitter' response. I never responded in the way they wanted me to.
In the past twenty years or so their players have always gotten more media attention than ours and have used it to mock us whilst deflecting from their own indiscretions.
During this time we have rarely had money and little success, and when you have to live with those insufferable beauts telling us about a 'boss' cup win, usually on penalties having spent millions and in reality underachieving, it does tend to grate.
Oddly enough I was out earlier today, a lovely sunny Bank Holiday afternoon and saw loads of Everton fans proudly wearing their replica shirts.
I was even stunned to see two brothers one a blue, one a red out and about together - that was commonplace at one time, I feel less so now.