@JollyRoseSheep I'm sorry, but to be honest, I think you were wrong to be so angry and to still be angry ( which is what you have asked in your post).
Disappointed, I can understand, if you hadn't realised that your husband giving the bride away meant that you would be at separate tables, but so angry you nearly walked out?
You said that you spent most of the time looking at your plate, so is it possible that the people at your table thought you were being very unfriendly in the extreme and just decided to ignore you for the most part. The jibe about taking your Dad to bed was indeed rude - but what (exactly) did you say that sparked that comment? Was your anger coming across to them? It might be time for some self-reflection on how you came across?
If you came across to the folk at your table, (the way you are coming across here) as angry/sulking/complaining and not wanting to engage with them, they would feel absolutely no obligation to be nice to you since they didn't know you. That kind of situation is a 2 way street when it comes to communicating with others.
However, given how bad the relationship is between you and your SIL ( MoB) if it had been me, I would probably not have gone and let my OH go without me. But that's me!