So, I don't feel the senior person in this case is necessarily wrong. So many languages give you 30 ways to do anything, it's key for a team to agree on standar

So, I don't feel the senior person in this case is necessarily wrong. So many languages give you 30 ways to do anything, it's key for a team to agree on standards so that code is more easily read by everyone on the team. If you disagree about the style being suggested, don't argue back directly, but instead try to set up a quick chat with him/her and/or the team to suggest a different way of doing things. Having each member of a team having their own unique style gets annoying and confusing, to be honest. As for conflict in general... communication. Be absolutely direct, but not confrontational. Do not be passive aggressive, or round a bout in your words. That's always worked for me, at least - not for getting my way, but getting clarification in the shortest time possible.