Hi,
You did arrive late to the cooking class whereas you had all the info the day before. Your plane did not land at the time of meeting so we consider that this excuse is not available. You had then the address (that was 10minutes away in taxi) and you arrive after 30 minutes.
The disrespect came from you, I don’t think that the sentence you quote and modified was disrespectful, this is not really honest from you.
(This is the real sentence: “We can keep looking for excuses but the fact is that you were late, all our clients had the same adress and managed to get the cooking class“)
Best regards.