This may depend a lot one’s definition and application of the terms “liberal” and “conservative”.
Does “liberal” mean “tolerate” as in a society “tolerating” (as in permitting) all forms of behavior by others? That doesn’t sound like the foundation of a stable society.
Perhaps this is meant as advice to the individual with the intention of reducing confrontations with others. I think that might be worth considering, but even in that context such a philosophy cannot be absolute.
Conflict is the natural result of independent thinking and “always” subjugating one’s interests in favor of others ultimately leads to the oppression of those too eager to relinquish their rights by those who would gladly exploit them.