I don't understand the argument from some vegetarians/vegans.
If you eat meat you have no right to object to any form of animal cruelty or abuse.
So because person A eats meat, person B who believes animals should not be eaten and that it is cruel and that everyone should be against animal cruelty wants person A to be ok with cruelty to animals in any form. 
Surely it would make more sense for someone who objects to cruelty to animals to be agreed with rather than attacked by people who object to cruelty to animals. Instead you get well, you had sausages for dinner so you have no right to want the police to prosecute someone who got two pitbulls in a cage and made them rip each other to bits.
It seems the desire to attack meat eaters is stronger than the desire to come together to condemn an act both agree is unacceptable.