I'm in my mid 30's and generally agree with this attitude. However, I have a couple of rules: 1) Avoid swearing with clients/customers/investors, at least wai

I'm in my mid 30's and generally agree with this attitude. However, I have a couple of rules: 1) Avoid swearing with clients/customers/investors, at least wait until a relationship is established and they signal they're okay with it. 2) Avoid swearing in written communication, e.g., in emails or commit messages – don't even really like seeing it in team-wide slack channels, though I do it occasionally. I don't mind swearing personally, but I do think it can be rude or unprofessional. Part of it is just signaling that you understand business etiquette and how to be polite in that setting – i.e., "professional." For example, if I'm interviewing someone who immediately starts dropping tons of f-bombs, I'm going to judge that negatively – not as a deal breaker but as a warning flag. I guess it would be similar to how I'd react if somebody immediately launched into a diatribe about religion or politics (regardless of whether I sympathized with their view). Like swearing, they're fine in a conversation between acquaintances, but they can easily veer into offensive territory if you don't know the other person. If you don't understand or don't care that you might be offending someone, I would be concerned about your ability to communicate effectively.