Throughout the series Penny is highly sexualised and treated with little respect from the other characters.
In this clip, Penny calls Howard out on his 'creepiness' when he keeps flirting with her even though she has repeatedly told him to stop. Howard's actions are made to seem okay in this show because he goes off after Penny upsets him, making him seem like the victim here. Isn't Penny also the victim of unwanted harassment? At the end of this episode, Leonard makes Penny apologise to Howard by bringing up favours that he is owed. However, Howard is expected to apologise to Penny at all- not for making her uncomfortable or for harassing her- he is expecting an apology because he doesn't believe anything is wrong. This shows that this is what people expect to happen in real life- that she should apologise to him because she made him upset but why shouldn't he apologise when he made her upset in the first place?