the time to sell altcoins was at least 24 hours ago when the bitcoin price drop began. with every 10% drop in bitcoin, alts have been dropping at least 20%
and after bitcoin finishes up dropping, if it becomes stable altcoins will recover and by that time it is not a bad idea to buy them to benefit from their dead cat baounces.
but if bitcoin, after reaching bottom, reverses and starts having a rise, then you should stay away from alts because they will drop more.
But small altcoins may not survive after the panic sell. Even if they will, BTC is always first recover.
not necessary for small altcoins. this is only true for the big ones which will continue to drop.
the small ones are always going to be easier to pump, and pumpers who have lost money during this massacre have to make the money back and pumping small altocins is the way to do it.