Many expats move to Thailand for a different lifestyle.
Every expat has their own reason for moving to Thailand and they should not be judged.
Each person that moves away from their home country is in search of a different lifestyle.
Whatever lifestyle you choose in Thailand is up to you.
Many older, single expats retire to Thailand in places like Pattaya and Jomtien Beach.
If you are a single senior, you may have chosen a location like Pattaya for all the social interaction you find. No one has to be alone.
It is not ALL about sex and prostitution. Hanging out in a beer having a couple of beers with bar girls to hang out with? There is nothing wrong with that. Everyone needs human interaction and many lonely single seniors find enjoyment of just being able to have people around to hang out with.
Hua Hin on the other hand attracts lots of married expats. Hua Hin is a wonderful retirement destination and there is a nice beach and plenty to see and do for married, western expats. A good location for family with kids as well.
Chiang Mai has a large expat population.
Phuket has been over-run with Russians and that has cause a host of problems for the local officials. If you are after a beach location it is best if you look elsewhere; unless you are from Russia.
Some western expats marry rural gals from Isaan and move to Isaan to enjoy the farm life and peace and quiet. Costs are very low compared to the rest of Thailand and the people are very friendly.
You can find whatever lifestyle you are looking for in Thailand.
Make it your own personal paradise and pay no attention to the naysayers.
It is your life, make it the way you want.