Yes, it is rude and inappropriate to call an obese person a "truck" or use any derogatory terms or offensive language to describe someone based on their appearance. Making hurtful comments about someone's weight is disrespectful, hurtful, and can be emotionally damaging.
Using derogatory language to describe someone's appearance or body size is not only offensive but also perpetuates body shaming and contributes to a negative and harmful culture. It is essential to treat all individuals with kindness, empathy, and respect, regardless of their appearance or body size.
If you accidentally offend someone or use inappropriate language, it's best to apologize sincerely and learn from the experience to avoid making similar mistakes in the future. Being mindful of our language and treating others with dignity is a crucial aspect of fostering a compassionate and inclusive society.