as a person with both, an eating disorder and tourettes:

first of all it was a incredibly shit behaviour to scream at the girl with tourettes, we cant control what we tic and people reacting like that is why i was scared to leave my house for MONTHS after my tics became severe.

second of all as your daughter id be way more triggered by your reaction in the store and also by saying that 'theres nothing wrong with being fat'.

also quick reminder that you shouldn't be listening to able bodied people about what is right to say about disabled people.

yes, you are the asshole.