G-luck on the trade. I have AAPL sitting on uptrend line support (off the June 3, 2019 low) so personally, I’d wait until that level is taken out along with a solid break below today’s/yesterday’s lows in QQQ. Should AAPL bounce from here, which I am leaning towards, the first resistance comes in around 303.65 & the 311.74.
Should it break down, I’d target the intersecting 255.74 & 200-ema support about 12.5% below current levels Here’s my daily chart.

Agreed. I noticed the underperformance of the SPX yesterday & today as well.. typically not a good sign for the overall market as it indicates the FAAMGs are bearing most of the weight right now. However, I often say that one day (or a few days) does not make a trend so best to monitor to see if that underperformance continues going forward.
As of now (3:05pm), all 5 FAAMGs (FB, AMZN, AAPL, MSFT & GOOG) trading green along with QQQ yet SPY is -0.36%. Energy, industrials, financials & discretionary seem to be weighting the broad market down… not the best sectors to be underperforming.

Just put a little short trade on Apple, with my broker indicating 89% long interest now. Fully expecting a liquidity crisis at some stage if this level of complacency continues.