During the Holocene it was basically everywhere in Europe colder than it is right now
We're in the Holocene, right now. However, during the Medieval Warm Period, the Roman Warm Period and the Bronze Age Warm period it was warmer than now in Europe. Additionally, during the Holocene Climatic Optimum it was warmer, globally, than now:
Current global temperatures of the past decade have not yet exceeded peak interglacial values but are warmer than during ~75% of the Holocene temperature history.
source: Marcott et.al 2013
The rate of temperature change now does not surpass previous periods, during which insects had no problems surviving.
Until a few decades ago it was generally thought that all large-scale global and regional climate changes occurred gradually over a timescale of many centuries or millennia, scarcely perceptible during a human lifetime. The tendency of climate to change relatively suddenly has been one of the most suprising outcomes of the study of earth history, specifically the last 150,000 years (e.g., Taylor et al., 1993). Some and possibly most large climate changes (involving, for example, a regional change in mean annual temperature of several degrees celsius) occurred at most on a timescale of a few centuries, sometimes decades, and perhaps even just a few years. The decadal-timescale transitions would presumably have been quite noticeable to humans living at such times, and may have created difficulties or opportunities (e.g., the possibility of crossing exposed land bridges, before sea level could rise)
source: Sudden climate transitions during the Quaternary (Adams, Maslin, Thomas)
Now tell me, since everything above is known and non-disputed climate science, why do you believe differently?
(And which "earth ages" have I "mixed up" specifically?)