I'm with the ladies. Alex spoke in full sentences at 18 months (like, "Mama, big truck is coming", or 'What a freakin mess". ) That was my influence.

Samantha just turned 1 and doesn't say didly. Not mama, papa, baba...nothing. But I know she understands me when I speak to her or ask her a question because she does what I ask.
It's weird for me because I always thought that all 1 year olds talk when Alex was little. Everyone we would meet would be so impressed with the way he spoke (I wasn't). Now I get it.
Don't worry (I know that you aren't), and you are not defensive. The therapists are just trying to do their job, but speak up if they make you feel belittled.