AITA For ending my friendship because of this?

So me and my friend, had an argument. They put a status on Instagram, and shared their opinion on a topic. I disagreed and so I simply shared what I thought, I had no malice, no anger or any desire to offend or hurt my friend. My replies were short and contained not even a hint of aggressiveness or criticism.

The last reply to that status compared them to something, and from their replies i could tell they probably didn't know what it meant, yet they were deeply offended perhaps thinking it was an insult and i was kind of dismayed.I thought, "What? Why are they mad?".They replied with long walls of text, livid and aggressive. Cussing and all that. So I apologized, then they replied to my opinions and I did the same thinking they wanted to discuss it. However, all her replies were aggressive and filled with insults, they called me ignorant and blind and so on.

I kept arguing without giving their aggressiveness any thought, it did make me a bit angry but not that much and i controlled myself. Then they cussed at me and told me to leave them alone. I couldn't understand why they were so mad, so I wrote a long reply saying how i apologized and that I did not ask for an apology even though they insulted me, they dismissed it by calling it the declaration of independence by Mr yappington from Harvard with no degrees.

And I also kept arguing, long story short, they proceeded to insult me more, calling me a failure, and bringing up my relationships and insulting me on that point.

So, I was like that's it, I cannot keep apologising and putting myself down. I apologised one last time for being obnoxious, pretentious and argumentative, and told them they were being defensive and abusive for no good reason. And blocked them.

I know what I did wrong here, they are younger than me, a child basically, and I acted quite immature and foolish, but i am not argumentative in the confrontational sense, i like discussing and talking about things. So I just thought, "I'll reply to this and this and tell them what I think", but i should have stopped. I didn't want to act condescending, but i guess I came across like that, albeit inadvertently, because the topic happened to be something I was interested in and liked, and knew a good deal about. I admit my mistakes, however, they had no right to abuse me like that.

I don't regret it.