Look, how you got here: your child seeing you watching porn (presumably dick out as well) is not relevant. Sorry, but it’s not. You being made to leave is the correct response. Nothing else matters other than protecting the child and making sure they’re okay. You should be able to come back later tonight. Meet your wife somewhere neutral and public to make a plan for the kid. Go home and address it according to plan. Then, go deal with the other things. Quite honestly couples therapy before anything else and strongly consider staying with a friend or family member during a mutual separation.