Despicable Customer Service

After arriving in excess of what is required before boarding (20 minutes), not only was I denied boarding, but was lambasted and insulted by one of the Turkish Airlines staff at Istanbul Airport for being "late". I then had to pay full price for a new ticket and book a hotel for the night. After laying a complaint, Turkish Airlines basically responded by saying it was my fault I was late and said "during the interpersonal communication, misunderstanding is possible from time to time". They did not even apologise. I quite genuinely have never been treated so disgustingly by an airline in my life. Shameful. Please DO NOT fly Turkish Airlines at all costs. They are a disgrace