It is not supposed to be insulting. According to Wikipedia:

To put “lipstick on a pig” is a rhetorical expression, used to convey the message that making superficial or cosmetic changes is a futile attempt to disguise the true nature of a product or person.

Though, it may not be conveying my idea. Something like “you cannot teach old dog new tricks” might have been better, but not exactly what I wanted to say, either.

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Project Lead for the Kotlin Programming Language @JetBrains

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