Most people will avoid uncomfortable emotions and situations if they can. It's easier for these people to like OW's posts than confront what she did. Plus, a lot of people don't realize how much infidelity hurts until they've experienced it for themselves. It's like knowing that childbirth hurts - there's a whole other level of understanding after you've been through it.
ktez, I wouldn't say you're being "too sensitive or superficial" about this, but you are "pain-shopping" to a certain extent here. What are you gaining from this? Are you going to cut these people off for supporting her? If not, block her and do your best to forget about her. She's living rent-free in your head, messing up your day, and you can work on preventing that.
Ultimately you have choices about your life going forward: stay with your WH or leave him. Stay friends with people who support OW or dump them. Follow OW's exploits, or block her and cultivate indifference.
These aren't moral choices, just personal ones based on your values, feelings, and the future you want to have.
[This message edited by NoThanksForTheMemories at 9:44 PM, Thursday, April 9th]