Can I get my stamp at the Malaysian land border when re-entering Thailand on a DTV visa?

No legal reason, no - unless you are actually either broke or reasonably likely to intend to work in Thailand illegally. Beyond that, a human could be the reason - for various reasons: Ranging from corruption (wanting bribery) to just making things up. Like telling you that you would need to stay at least a night or two - or demanding documentation that was only necessary for getting the visa in the first place but should not be relevant on border crossing. In reality, with a valid DTV, your risk should be close enough to zero, though. So, happy re-entering.