Hi Sri. Here are a few options: It could be argued that... It could be said that... One could also say that... One could also argue that... A possible (alternative/objection) might be... It could be reasoned that... Alternatively, one might argue that... Hope that helps! Best wishes, Guilherme.

Or if you want to be very assertive / rude, you could say "Anyone in their right mind could see how many of Donald Trump's comments are both racist and mean in nature." If the other person doesn't agree with your argument, then they are crazy / not in the right mind. Buahahaha :P