This is getting ridiculous

So we've been potty training our 2 year old. Well my husband had the bright idea to tell him to go pee on a tree. My 2 year old now thinks it's okay to use the bathroom outside. We were at the park today and this booger poops in the park on the grass. I was trying to take care of my 5 month old and watch my 7 year old and I am so Embarrassed!!!! Like do I pick it up? Like what do I do? Well it's kind of funny and can't really be picked up so I have all these people watching me walk away from the poop. P.s. he had an audience watching him do this!!! 😤💩💩🤦🤦