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ZenKitzune Service animal laws and rights were very hard won and service animal owners still get lots of hassle.
emotional support animals are not service animals. They don't have expectations of training, social behavior like service animals do.
So while many people properly train their emotionally support animals to behave in public most do not. Then you have people that just take their pet and call it emotional support or service animal, which is illegal, and make a bad name for actual service animals.
In the end many businesses will try to find false reasons to keep out both service and support animals because of the headache from misbehaving emotional support pets, knowing the authorities are very slow to act on claims of service animal discrimination.
So in the end people with actual service animals get refused service or harassment just for simple things because ESA abusers make a bad name for them.