It is always wise to be prudent. We might be going to the catacombs soon so obviously it's wise to be discerning especially with the heretics in our midsts. But I believe a cautious life-line can be offered if you believe it is going to be effective.
It's good to genuinely know and believe your position. So, there could be a list of reasons for a newbie
1) The NO isn't as reverent
2) The Latin Mass reflects the faith of our fathers
3) The NO came out of V2. Here are some issues with the V2 Church
4) Now, given the above ... would you continue to go to the NO? and if so why?
Then you might spot a modernist - e.g. I actually uncritically believe in what V2 popes say here, and the previous statements of the popes 🚨🚨🚨
Then, ... And whosoever shall not receive you, nor hear your words: going forth out of that house or city shake off the dust from your feet. Matthew 10:14
The enemy would like us to be impotently sitting on the internet and refusing to the discuss the issues in public. But, why did ++ Lefebvre publish works like They Have Uncrowned Him and An Open Letter to Confused Catholics?
Traditional Catholicism that is neutered and tame is like a re-enactment society. We must have a goal and support growth away from the heresies.. and growth towards the tradition.
Our goal is to grow, not be a society of effete tea drinkers... or a good joke for the modernists ... we have to be more effective than that...