Don't be that person, especially when you're wrong. Both forms are acceptable.
"In Australian and British English, 'practise' is the verb and 'practice' is the noun. In American English, 'practice' is both the verb and the noun."
"In Australian and British English, 'practise' is the verb and 'practice' is the noun. In American English, 'practice' is both the verb and the noun."
Now tge real question is, was the poster in a state of duress when thy typed that response?