Be wary of Those Does Not Thank You

I couldn't find the exact post you're referring to, but I can certainly analyze the sentiment behind the statement.

The phrase suggests a cautionary perspective on people who fail to express gratitude when receiving gifts or favors. It implies that saying "thank you" is not just a polite gesture but a reflection of one's character. Gratitude is often seen as a fundamental social norm that fosters goodwill and strengthens relationships. When someone neglects to acknowledge a gift or kindness, it might indicate entitlement, lack of appreciation, or even a disregard for social etiquette.

However, it's also worth considering that cultural differences, personal circumstances, or even social anxiety can affect how people express gratitude. Some individuals may not verbalize their appreciation but show it through actions instead.