Will I be refused entry to Thailand if I have visited multiple times on a visa-exempt basis?

They tend to provide a polite warning first, unless abuse is clear and obvious - the ETA can’t come soon enough will put people’s minds at rest before they travel and eliminate all the so called “scaremongering”

Doubtful they encourage tourists try not to read too much into all the scaremongering on these sites. It’s horrific some days and so much false information

That’s what I plan to do this year. 2 to 3 visits on tourist exemption

Two occasionally three visits per year for last 14 years all 15-21 day trips from UK all on the day visa exempt. Return flights booked never a single issue. As Brandon says if you have the above you should sail through.

No problem.

Refused entry is unlikely. Even if they are not happy with your visit, they'll usually give you a warning first.

If you are worried, just make sure you have the 3 proofs that they can ask for of a tourist:

1) Proof of funds (20,000 baht or equivalent in another major currency IN CASH ONLY)

2) Proof of onward travel (a ticket out of Thailand within 60 days)

3) Proof of lodging (at least a few nights hotel reservation)

Sounds like you would already have the proof of onward travel if you only plan to stay for 3 weeks.